If you haven't already sold your ALTs simply hold if your project is decent. If the project has no future sell and buy into a decent project. This is all you can do to recover your loss without putting in more money. It will probably take a couple of years to recover your loss!
Some ALTs will never recover from this crash!
It is an ugly situation!
I am agree that there is altcoin can not recover on the price because the project are dead. A lot pump and dump project and its better to sell it and buy a good project like Litecoin or ethereum. I hold a few project that already dead and the price can not recover again